The Cyrillic alphabet is a set of letters that are used for to represent the written forms of certain Slavic languages. Based on the Greek alphabet, it has a longer character set than Latin or Greek to better accommodate the different phonemes encountered in Slavic languages.
Cyrillic is named for Saint Cyril, who, with his brother, Saint Methodius, were apostles to the Slavs. Cyril is usually credited for devising the Glagolithic script for the South Slavic languages, but the attribution to him for Cyrillic letters is significantly less firm.
The Old Church Slavonic (OCS) version of the Bible is close to what the historical linguists term proto-Slavic, though it is more accurately an early form of the South Slavic dialect. A slightly archaic Cyrillic alphabet is used for Eastern Orthodox liturgy and scripture in this language.
The alphabet itself showing both upper and lower cases:
А а Б б В в Г г Ґ ґ Ѓ ѓ Д д Ђ ђ Е е Ё ё Є є Ж ж З з Ѕ ѕ И и І і Ї ї Й й Ј ј К к Ќ ќ Л л Љ љ М м Н н Њ њ О о П п Р р С с Т т Ћ ћ У у Ў ў Ф ф Х х Ц ц Ч ч Џ џ Ш ш Щ щ Ъ ъ Ы ы Ь ь Э э Ю ю Я я